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原理图：
注：java8中，已经将常量池移动到堆中
部件详解：
举例：执行add(1,2)
Method area is created on virtual machine startup, shared among all Java virtual machine threads and it is logically part of heap area. It stores per-class structures such as the run-time constant pool, field and method data, and the code for methods and constructors.
